BaseTools: Optimize string concatenation

https://bugzilla.tianocore.org/show_bug.cgi?id=1288

This patch is one of build tool performance improvement
series patches.

This patch is going to use join function instead of
string += string2 statement.

Current code use string += string2 in a loop to combine
a string. while creating a string list in a loop and using
"".join(stringlist) after the loop will be much faster.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: BobCF <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/BaseTools/Source/Python/Workspace/InfBuildData.py b/BaseTools/Source/Python/Workspace/InfBuildData.py
index d10cfea40d..99bbecfd1f 100644
--- a/BaseTools/Source/Python/Workspace/InfBuildData.py
+++ b/BaseTools/Source/Python/Workspace/InfBuildData.py
@@ -614,7 +614,9 @@ class InfBuildData(ModuleBuildClassObject):
             Instance = Record[1]

             if Instance:

                 Instance = NormPath(Instance, self._Macros)

-            RetVal[Lib] = Instance

+                RetVal[Lib] = Instance

+            else:

+                RetVal[Lib] = None

         return RetVal

 

     ## Retrieve library names (for Edk.x style of modules)